Two-dimensional image splicing method based on optical grating positioning in automatic visual inspection

A technology of automatic visual inspection and two-dimensional image, applied in image enhancement, image data processing, instrument and other directions, can solve the problems of local feature coincidence, splicing error, influence of detection accuracy, etc.

Active Publication Date: 2013-12-18
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Abstract
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Problems solved by technology

When the surface of the detected device has repeated texture features, the current splicing method is

Method used

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  • Two-dimensional image splicing method based on optical grating positioning in automatic visual inspection
  • Two-dimensional image splicing method based on optical grating positioning in automatic visual inspection
  • Two-dimensional image splicing method based on optical grating positioning in automatic visual inspection

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[0051] Example 1:

[0052] A two-dimensional image mosaic method based on grating positioning in automatic visual inspection. The coordinate value of the sub-picture in the large picture is corrected by the angle parameter between the shooting platform and the camera coordinates, and the position coordinates of the four corners of each sub-picture are calculated. The actual physical distance to get the size of the large image, use bilinear interpolation to calculate the pixel gray level of the sub-pixel coordinate position in the sub-image to obtain the pixel gray level in the large image, and obtain the large image after splicing. The specific steps are:

[0053] S1: Calculate the physical size Δd represented by a single pixel in the image, the steps are:

[0054] S11: Make a disc grid calibration sheet, set non-overlapping calibration dots on the disc grid calibration sheet, the calibration dots and the disc grid calibration sheet have a clear boundary, the calibration dots ...

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Abstract

The invention belongs to the field of image automatic inspection and particularly discloses a two-dimensional image splicing method based on optical grating positioning in automatic visual inspection. The splicing method includes the steps of modifying the coordinate values of sub-images in a large image according to the coordinate included angle parameter of a shooting platform and a camera, calculating the position coordinates of four corners of each sub-image, obtaining the size of the large image through the actual physical distances corresponding to all pixels, calculating the pixel gray levels in sub pixel coordinate positions of the sub-images through bilinear interpolations to obtain the spliced large image, conducting modification to eliminate errors caused by inconformity of shooting coordinates through the coordinate included angle parameter of the shooting platform and the camera, and directly conducting calculation through the coordinate positions of the sub-images in the splicing process at the same time. Therefore, splicing errors caused by a splicing method where image features are used for inspect splicing are avoided, meanwhile, sub pixel accuracy is adopted for all the calculated coordinates, and the quality of the spliced image is improved.

Description

Technical field: [0001] The invention belongs to the field of automatic image detection, and specifically discloses a two-dimensional image mosaic method based on raster positioning in automatic visual detection. Background technique: [0002] In industrial production, it is necessary to inspect the surface of devices with textured features. Since the surface texture features of the inspected device are relatively small and cannot be distinguished by the naked eye, it is necessary to collect images by taking pictures, and then use the images for inspection. In order to ensure the accuracy of surface texture detection, it is necessary to take high-precision images. When the inspected device is large in size, the camera cannot capture all the device surfaces in one image. It is necessary to take multiple sub-images of the surface of the inspected device, and then form a complete large image through image stitching for inspection. When the surface of the detected device has ...

Claims

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Application Information

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IPC IPC(8): G06T5/50
Inventor 刘霖陈伟孙文缎唐雪松罗颖宋昀岑刘娟秀杨先明陈镇龙
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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